Sash-operating mechanism



Sept. 3, 1929. s, H, HART 1,726,621

v SASH OPERATING MECHANISM Filed Maron 24, 19254 "n 2 5 23 y :T A INVENTOR S22/w? U5/'arf BY im ATTORNEYS Patented Sept. 3, 1929.

UNTED STATES 'PATENT OFFICE.

.STEPHEN H. HART, OF IRVINGTON, NEW YORK, ASSGNOR TO LORD & BURNHAM COMPANY, OF IRVINGTON, NEW YORK, A CORPORATIONOF NEWIYORK.

, SASH-OPERATING MECHAN ISM.

Application filed March 24, 1925. Serial No. 17,853.

This invention relates to an improved sash operating mechanism, especially adapted for operating the Ventilating sash of greenhouses and-the like, though not limited to this particular use.

The primary object of the invention is the provision of means whereby the co-acting elements of the mechanism may be supplied with a lubricant, thereby assuring a free and easy movement o-f -s'aid elements and an attendant reduction in the wear and tear due to friction. i,

Another object of my invention is to provide a mechanism that will elevate 0r lower a series of sashes to apre-determined position and there secure the same against accidental closing.

With the foregoing and other objects in view, the invention consists in the details of construction and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this specification wherein like characters denote correspon:-

ing parts in theA several views, and in which- Figure 1 is a side elevation, partly in section, illustrating the sash operating mechanism mounted in operable position on a green-house.

Fig. 2 is a detail end View of a rack and pinion closure means and further illustrating a method of centering the related parts;

Fig. 3 is a central longitudinal section taken on the line 3-3 of Fig. 4, showing the relation of the parts comprising the rack and pinion closure means; and l Fig. 4 is a vertical central section taken on the line 4 4 of Fig. 3. y In the drawings 5 denotes a fragment of the roof of a greenhouse, 6 a supporting beam and 7 a Ventilating sash hingedly mounted onsaid roof, all of which being of ordinary construction.

It will, of course, be understood that in applying my improved sash operating mechanism to a greenhouse, I contemplate the operation of a long series of Ventilating lsashes, and to this end 1 provide a relatively long rotatable shaft 8 extending longitudinally of said greenhouse, said shaft being supported by brackets 9, depending from the beams 6 at suitable intervals. I

The shaft 8 carries a series of pinions 10, rigidly secured thereto, as indicated at 11, (Fig. 2), each of said pinions having hub portions 12 and 13, and annular shoulders 14 and 15, between which are cut teeth 16, as best shown in Fig, 3.

Pivotally connected to the lower ends of a series of Ventilating sashes are a plurality of arcuate rack bars 17, the teeth thereof loosely meshing with said pinion` 10, as shown in Fig. 4.

Each rack and pinion is provided with closure means, which may be termed a saddle. This saddle is denoted generally by the .numeral 18 and comprises two similar sections, or plates 19 and '20, preferably made of pressed metal, said plates being secured together by means of the bolts 21, as clearly .shown in the drawings.

On reference to Fig. 3, it will be noted that said saddle 18, is provided with an inwardly directed peripheral ange 19a in the case ofthe plate 19, and a similar flange 20a in the case of the plate 20. Thus when the two plates are secured together, said `flanges define a chamber, the purpose of which will be hereinafter pointed out. Further, it should be observed that the saddle 18 is pressed outwardly, as indicated at 22, and centrally thereof is provided with openings 23 and 24 for the reception of the hub portions 12 and 13 respectively, the inner rims defined by said openings loosely embracing the annular shoulders 14 and 15 of said pinion.

The ianges 19L and 20a are recessed, las

v indicated at 25, for the passage of said rack Carried by the bolts 21, adjacent said rack, are anti-friction rollers 26 and 27, which loosely bear against the upper surface of said rack and insure the required amount of clearance between these meshing members.

The flanges 19a and 2On are further provided with interlocking means in the form of la V-shaped tongue and groove arrangement, as indicated at 28, Fig. 2. This pro- Vision materially assists in centering the plates 19 and 2O and prevents slippage thereof in the event the bolts 21 become loose or worn. v

When the above description is considered in connection with the drawings, it is manifest that I have devised a mechanism that is neat in appearance and compact in arrangement. Y

The chamber defined by the saddle plates is comparatively tight and may therefore be packed with a thick grease to assure the proper lubrication of the coacting parts.

Under this arrangement the `friction between rollers and rack, and between rack and pinion is reduced to a minimum thereby insuring long life to these' parts and a positive and easy manipulation thereof.

It will, of course, be understood ythat the shaft 8 may be rotated either by hand or by a power lift, but as the rotating means forms no part of the present disclosure it is felt that a detailed description and illustration thereof may be safely omitted.

The operation of the'device by this time is surely clearly understood but it may be pointed out that for safety sake I have provided a stop 17L for the purpose of limiting the upward travel of said rack.

The saddle 18 is movably mounted upon the shoulders 14 and 15 of said pinion, and has a limited rotary movement with respect to the shaft 8, and when in the position indicated in Fig. 1, said rack 17 is clamped between the teeth of said pinion and the roller 27, which prevents downward displacement of said sash. In other words, the device is self-locking at a pre-determined position.

The invention is susceptible of modifica-` tion and the embodiment hereinafter set forth and shown in the drawings is, therefore, tobe considered as illustrative7 rather than restrictive, of the scope of the invention.

I claim:

1. In a device of the character described, a pinion having oppositely directed hub portions defining annular shoulders,'a rack meshing with said pinion, a saddle coniprising .sections having inwardly directed flanges and an outwardly pressed central portion embracing said shoulders and defining a lubricant chamber for the reception of.

said pinion and said rack, anti-friction rollers contacting the inner face of said rack and means comprising a tongue and groove arrangement for centering said sections of said saddle and to preventslippage thereof.

2. In a device of the character described, a pinion having a pair of annular shoulders one on each side of the toothed portion thereof, a rack meshing with said pinion, and a rotatable saddle comprising a pair of sections each having inwardly directed flanges and anoutwardly pressed central portion embracing said annular shoulders .inner peripheral edges of said central portions embracing said annular shoulders to form a bearing during the rotation of said pinion within the casing.

STEPHEN H. HART. 

